linux-kernel - Re: [PATCH 07/11] sdhci: Add quirk to suppress PIO interrupts during DMA transfers

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Message-ID: <20090208220255.6fb15ea8@mjolnir.drzeus.cx>
Date:	Sun, 8 Feb 2009 22:02:55 +0100
From:	Pierre Ossman <drzeus@...eus.cx>
To:	Anton Vorontsov <avorontsov@...mvista.com>
Cc:	Ben Dooks <ben-linux@...ff.org>, Arnd Bergmann <arnd@...db.de>,
	Kumar Gala <galak@...nel.crashing.org>,
	Liu Dave <DaveLiu@...escale.com>, sdhci-devel@...t.drzeus.cx,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH 07/11] sdhci: Add quirk to suppress PIO interrupts
 during DMA transfers

On Fri, 6 Feb 2009 21:06:55 +0300
Anton Vorontsov <avorontsov@...mvista.com> wrote:

> Some hosts (that is, FSL eSDHC) throw PIO interrupts during DMA
> transfers, this causes tons of unneeded interrupts, and thus highly
> degraded speed.
> 
> This patch adds SDHCI_QUIRK_PIO_IRQS_DURING_DMA quirk. When specified,
> the sdhci driver will disable PIO interrupts during DMA transfers.
> 
> Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
> ---

It's probably better to change the interrupt handling to only enable
relevant interrupts instead of having everything on constantly. Too
many quirks just makes the driver difficult to understand.

-- 
     -- Pierre Ossman

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